大厚度DH36高强海工钢GMAW+SAW焊接接头的微结构与力学性能  

Microstructure and Mechanical Properties of GMAW+SAW Joint of Heavy Thickness High Strength Marine Engineering Steel DH36

作　　者：那雪冬 雷承志 罗伟[2] NA Xuedong;LEI Chengzhi;LUO Wei(Nantong Taisheng Blue Island Offshore Co.,Ltd.,Qidong 226259,China;School of Materials Science and Engineering,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]南通泰胜蓝岛海洋工程有限公司,江苏启东311305 [2]浙江大学材料科学与工程学院,浙江杭州310027

出　　处：《材料科学与工程学报》2022年第4期615-620,629,共7页Journal of Materials Science and Engineering

摘　　要：为满足大承载海工结构的焊接需求,作者对60mm厚DH36-Z35高强海工钢进行了CO_(2)气体保护熔化极弧焊GMAW(Gas metal arc welding)+埋弧焊SAW(Submerged arc welding)的组合焊接研究。结果表明,CO_(2)GMAW采用CHW50C6SM焊丝,SAW采用CHW-S3焊丝配以CHF101焊剂,焊接接头未出现软化现象,力学性能满足相关标准要求;350℃及以下温度保温1h的焊后热处理可细化焊接热影响区HAZ(Heat affected zone)的组织,但对焊缝组织影响很小,且一定程度上降低了焊接接头强度和低温冲击韧性;无预热CO_(2)GMAW打底焊层为焊接接头力学性能的薄弱层。In order to meet the welding requirements of offshore structures with high load capacity,the microstructure and mechanical properties of CO_(2)GMAW+SAW joint of high strength marine engineering steel DH36-Z35 with 60 mm thickness were investigated.The results showed that no softening occurred in the joints with CHW50 C6 SM welding wire used for CO_(2)GMAW,and CHW-S3 welding wire and CHF101 flux used for SAW.The mechanical properties of the joints met the requirements of relevant standards.Post-weld heat treatment at 350℃and below for 1 h could refine the microstructure of HAZ,but had little influence on the microstructure of weld,and reduced the strength and low temperature impact toughness of the joint to a certain extent.The bottom layer of CO_(2)GMAW without preheating was a weak layer for the mechanical properties of the joints.

关 键 词：海工结构钢 大厚板 焊接 组织 力学性能 

分 类 号：TG457.11[金属学及工艺—焊接]